Legal claims defining the scope of protection, as filed with the USPTO.
1. A method comprising: transmitting a signal comprising a plurality of fixed length symbols each having a respective cyclic prefix having a fixed cyclic prefix length; wherein when the fixed cyclic prefix length is insufficiently long to prevent ISI between adjacent symbols, the fixed length symbol including an amount of zero padding necessary to avoid ISI, wherein a time duration of the zero padding in addition to the fixed cyclic prefix length is substantially equal to and not greater than a channel delay spread.
2. The method of claim 1 further comprising: Estimating a channel delay spread; inserting the zero padding based on the estimated channel delay spread.
3. The method of claim 1 wherein the step of inserting zero padding includes inserting a zero tail into a fixed length symbol.
4. The method of claim 3 wherein the step of inserting zero padding further includes inserting a zero head into the fixed length symbol.
5. The transmitter of claim 1 further comprising: a channel delay spread estimator for estimating a channel delay spread; wherein the zero padding inserter inserts the zero padding based on the estimated channel delay spread.
6. The transmitter of claim 1 wherein the zero padding inserter inserts a zero tail into a fixed length symbol.
7. The transmitter of claim 6 wherein zero padding inserter further inserts a zero head into the fixed length symbol.
8. An apparatus comprising: a transmitter configured to transmit a signal comprising a plurality of fixed length symbols each having a respective cyclic prefix having a fixed cyclic prefix length; a zero padding inserter configured to, when the fixed cyclic prefix length is insufficiently long to prevent ISI between adjacent symbols, insert in each fixed length symbol an amount of zero padding necessary to avoid ISI, wherein a time duration of the zero padding in addition to the fixed cyclic prefix length is substantially equal to and not greater than a channel delay spread.
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March 26, 2019
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